71917 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71917 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71917 CEGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing features an Extra Light (Class A) preload and is manufactured to a P4A super-precision tolerance class, ensuring minimal runout and superior rotational accuracy. Its core advantage lies in its ability to handle high-speed operations while providing excellent rigidity, making it ideal for high-speed spindles and other precision machinery. The use of ceramic balls and a phenolic cage further enhances its high-speed capability and reduces rotational mass.
71917 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71917 | Basic bearing series and size designation | Indicates a metric, 85mm bore, 120mm OD, 18mm width bearing. |
| C | 15° Contact Angle | Optimized for high-speed applications with moderate axial load capacity. |
| EGA | Universal Matchable (SU) designation | The bearing is universally matchable with other bearings of the same code, allowing for flexible arrangement in sets (back-to-back, face-to-face, or tandem) without selective assembly. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls (typically silicon nitride) with steel rings, offering reduced weight, higher stiffness, and superior performance at high speeds. |
| P4A | Tolerance Class | Denotes a super-precision tolerance grade with restricted width tolerance, ensuring extreme accuracy and running consistency. |
71917 CEGA/HCP4A Bearing Structural Features & Performance Benefits
The 71917 CEGA/HCP4A's performance is derived from its advanced material selection and precision engineering:
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications.
- Phenolic Resin Cage: The phenolic cage is lightweight and possesses excellent slip characteristics, contributing to smooth operation at the bearing's high limiting speed of 17,000 rpm.
- Precision & Rigidity: Manufactured to P4A tolerance class with an Extra Light preload, this bearing provides high system rigidity, minimizes deflection under load, and ensures precise shaft positioning.
- Universal Matching: The Universal Matchable (SU) feature allows for simplified installation and optimal performance in multi-bearing arrangements, providing design flexibility for complex spindle assemblies.
- Open Design & Lubrication: The open seal type allows for various lubrication methods, while the pre-lubrication ensures immediate operational readiness.
71917 CEGA/HCP4A Bearing Typical Application Areas
This high-precision, high-speed angular contact ball bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and engraving machines.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical instrumentation.
